package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.beans.BeanUtils;
import org.springframework.stereotype.Component;

import java.beans.beancontext.BeanContext;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

/*
 * 自定义切面类，实现公共字段的自动填充方法
 * */

@Component
@Aspect
@Slf4j
public class AutoFillAspect {


    /*
     * 切入点定义
     * */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut() {
    }

    /*
     * 定义切面方法 前置通知 实现公共字段的自动填充方法
     * */
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) {
        log.info("开始公共字段的自动填充...");
        //获取当前执行方法的类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();//获取方法签名对象(方法唯一标识)
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获得方法上的注解对象
        OperationType type = autoFill.value();//获取注解类型

        //获取当前拦截方法的参数---实体对象
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0) return;
        Object entity = args[0];

        //准备赋值数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        //根据方法类型给公共属性赋值
        if (type == OperationType.INSERT) {
            try {
                //通过反射机制获取方法
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                //通过反射机制赋值
                setCreateTime.invoke(entity, now);
                setCreateUser.invoke(entity, currentId);
                setUpdateTime.invoke(entity, now);
                setUpdateUser.invoke(entity, currentId);
            } catch (NoSuchMethodException | IllegalAccessException | InvocationTargetException e) {
                e.printStackTrace();
            }

        } else if (type == OperationType.UPDATE) {
            try {
                //通过反射机制获取方法
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                //通过反射机制赋值
                setUpdateTime.invoke(entity, now);
                setUpdateUser.invoke(entity, currentId);
            } catch (NoSuchMethodException | IllegalAccessException | InvocationTargetException e) {
                e.printStackTrace();
            }
        }
    }
}
